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Online since: February 2024
Authors: Meshach Osaretin, Sylvester Onyemaechi Edelugo, Patrick Udeme Akpan, Cornelius Ogbodo Anayo Agbo, Paul Amaechi Ozor, Nita Inderlal Sukdeo
Gdoutos [5] argues that the crack opening mode is covered by the KI SIF for mode I, while the crack sliding mode is affected by the mode II stress intensity factor, KII, and the ripping mode is affected by the mode III stress intensity factor, KIII.
Table 2 presents the reinforcement property of each mat type.
It was observed that for all E-glass fiber laminate cases studied, the stress intensity factors become higher as the crack length, i.e., a/W, increases.
Miscchke, Mechanical Engineering Design.
Liu, Determining stress intensity factors of composites using crack opening displacement, Composite Structures, 81, 2007, pp. 614–621 [18] Janssen, M., Zuidema, J. and Wanhill, R., Fracture Mechanics.
Table 2 presents the reinforcement property of each mat type.
It was observed that for all E-glass fiber laminate cases studied, the stress intensity factors become higher as the crack length, i.e., a/W, increases.
Miscchke, Mechanical Engineering Design.
Liu, Determining stress intensity factors of composites using crack opening displacement, Composite Structures, 81, 2007, pp. 614–621 [18] Janssen, M., Zuidema, J. and Wanhill, R., Fracture Mechanics.
Online since: September 2011
Authors: Chun Zhang, Y.C. Li, H.B. Yu
Factors Influencing the Precision of Forming Workpiece
In order to meet the precision requirements of the workpiece, it is crucial to understand the factors affecting the forming precision and find the improvement strategies.
The important factors include the manufacturing and assembly accuracy, elastic deformation of press frame, slider clearance, and forging process, etc.
Considering that the shift can be eliminated by a reasonable balance device, the direct factor affecting the forming error only includes elastic deformation of die and lower beam.
Therefore it is naturally concluded that hypothesis that lower die has property of near pure flexible is sound.
Fig.7 Workpiece for case study Conclusion In the paper, factors influenting the forming precision of workpiece are analysized.
The important factors include the manufacturing and assembly accuracy, elastic deformation of press frame, slider clearance, and forging process, etc.
Considering that the shift can be eliminated by a reasonable balance device, the direct factor affecting the forming error only includes elastic deformation of die and lower beam.
Therefore it is naturally concluded that hypothesis that lower die has property of near pure flexible is sound.
Fig.7 Workpiece for case study Conclusion In the paper, factors influenting the forming precision of workpiece are analysized.
Online since: February 2008
Authors: Header Haddad, Syed H. Masood, Abul B.M. Saifullah
There are
many different factors that affect the gate location including : flow properties of the plastic
material, gating into the approximate center of the part, wall thickness, gating into an obstacle, style
of the gate, separation of the runner system from the part, aesthetic properties, and ease of
manufacturing.
Jetting is caused by the material streaming into the cavity, and affects the mechanical and chemical properties of the part, along with the aesthetic properties due to weld lines in the jetted area Gating into an obstacle, or using a larger gate, such as a fan gate or tab gate, may eliminate jetting.
Gating into an obstacle will also prevent jetting by expanding the melt as it flows into the mould, eliminating the stream known as jetting., however jetting cause the mechanical properties to reduce. [9] Ease of manufacturing is one of the most important factors in gate location.
Ideal gate location for chemical, mechanical, and aesthetic properties may cause tooling costs to be very high.
This gate location Positioned where the appearance is not important and the left mark would not affect aesthetic properties of enclosure.
Jetting is caused by the material streaming into the cavity, and affects the mechanical and chemical properties of the part, along with the aesthetic properties due to weld lines in the jetted area Gating into an obstacle, or using a larger gate, such as a fan gate or tab gate, may eliminate jetting.
Gating into an obstacle will also prevent jetting by expanding the melt as it flows into the mould, eliminating the stream known as jetting., however jetting cause the mechanical properties to reduce. [9] Ease of manufacturing is one of the most important factors in gate location.
Ideal gate location for chemical, mechanical, and aesthetic properties may cause tooling costs to be very high.
This gate location Positioned where the appearance is not important and the left mark would not affect aesthetic properties of enclosure.
Online since: April 2019
Authors: Aija Trimdale, Agris Bērziņš
Nitrofurantoin was crystallized from multiple mixtures of water and organic solvents with and without additives in order to find and identify factors affecting phase obtained in crystallization and provide possible information on crystallization control.
Although both hydrates are prepared by slow evaporation from acetone/water mixtures [2] there is lack of information describing conditions affecting formation of given hydrates.
Therefore, in this work it was decided to try to find and identify factors affecting phase obtained in the crystallization and gain information on possible crystallization control.
Based on the similarity in the properties it is believed that similar bonding is present in SNMP and SDMF II, although crystal structures of SNMP and SDMF II have not been determined.
Rantanen, Controlling solid state properties of pharmaceuticals with polymer selection, Annual Transactions of the Nordic Rheology Society. 16 (2008)
Although both hydrates are prepared by slow evaporation from acetone/water mixtures [2] there is lack of information describing conditions affecting formation of given hydrates.
Therefore, in this work it was decided to try to find and identify factors affecting phase obtained in the crystallization and gain information on possible crystallization control.
Based on the similarity in the properties it is believed that similar bonding is present in SNMP and SDMF II, although crystal structures of SNMP and SDMF II have not been determined.
Rantanen, Controlling solid state properties of pharmaceuticals with polymer selection, Annual Transactions of the Nordic Rheology Society. 16 (2008)
Online since: October 2013
Authors: Prasad K.D.V. Yarlagadda, Yuan Tong Gu, Beat Schmutz, Michael Schuetz, Javad Malekani
Accuracy of analysis and computational time are two important factors in efficiency of these tools.
This paper discusses about the parameters affecting simulation of deforming a distal tibial orthopedic bone plate.
In total, the solution can be optimized regarding the problem and solution factors.
Effective Factors in Solution of the Problem by Ansys Important factors of solution method, material model, geometric model, mesh configuration, number of the analysis steps, program controlled parameters and computer settings affect on the results and therefore are discussed in this paper.
Regarding the requirements in terms of application, biomechanical properties and the biological environment factors, orthopedic bone plates are made from highly isotropic biometals such as Stainless steel 316L and Ti-6Al-4V [12, 18].
This paper discusses about the parameters affecting simulation of deforming a distal tibial orthopedic bone plate.
In total, the solution can be optimized regarding the problem and solution factors.
Effective Factors in Solution of the Problem by Ansys Important factors of solution method, material model, geometric model, mesh configuration, number of the analysis steps, program controlled parameters and computer settings affect on the results and therefore are discussed in this paper.
Regarding the requirements in terms of application, biomechanical properties and the biological environment factors, orthopedic bone plates are made from highly isotropic biometals such as Stainless steel 316L and Ti-6Al-4V [12, 18].
Online since: January 2025
Authors: Mohamed Kalifa, Andrew Starr, Muhammad Khan
The relationship between these factors can be complex and is determined by many factors, including the materials of the surfaces in contact, the loads applied, and the operating conditions. [22,24].
Factors such as friction, wear, noise, lubrication, and rough surfaces have implications for motion systems [26,27].
The association between these factors is complex and determined by different circumstances.
Notably, only two current models address these factors, and they primarily focus on scenarios without lubrication.
The materials were tested under diverse load circumstances and wear routes to completely evaluate their performance properties. 2.
Factors such as friction, wear, noise, lubrication, and rough surfaces have implications for motion systems [26,27].
The association between these factors is complex and determined by different circumstances.
Notably, only two current models address these factors, and they primarily focus on scenarios without lubrication.
The materials were tested under diverse load circumstances and wear routes to completely evaluate their performance properties. 2.
Online since: December 2013
Authors: Kang Liu, Wen Ling Xie, Shun Yong Zhou, Cui Xia Guo
It analyzes measuring method of working fluid conductivity on the MSWEDM through the study of the working groove equivalent circuit model and the main factors affecting the conductivity measurement.
According to the theory and practice show that [2,3] in the WEDM Process, properties of working fluid will change ,the conductivity change is relatively large, which is a great impact on the WEDM, it is mainly the existence of "leakage" phenomenon in the process of discharge.
Fig. 1: Equivalent Circuit Model of Working Groove Factors Affecting the Measuring Solution Conductivity.
And but it is difficult or impossible to get values of the polarization resistance, because many factors affecting polarization resistance, such as the voltage values between the two poles, voltage duration and type of solution etc.
The environment temperature is the biggest external factors of directly affect the conductivity change of solution, which will affect the solution concentration, solubility, ion migration velocity and the viscosity of the solution.
According to the theory and practice show that [2,3] in the WEDM Process, properties of working fluid will change ,the conductivity change is relatively large, which is a great impact on the WEDM, it is mainly the existence of "leakage" phenomenon in the process of discharge.
Fig. 1: Equivalent Circuit Model of Working Groove Factors Affecting the Measuring Solution Conductivity.
And but it is difficult or impossible to get values of the polarization resistance, because many factors affecting polarization resistance, such as the voltage values between the two poles, voltage duration and type of solution etc.
The environment temperature is the biggest external factors of directly affect the conductivity change of solution, which will affect the solution concentration, solubility, ion migration velocity and the viscosity of the solution.
Online since: January 2013
Authors: Xu Xing Jin
Mar-M247 is widely used in industry for its excellent mechanical properties at high temperatures, but it has the shortcoming of difficulty manufactured.
Mar-M247 possesses the properties of high strength at high temperature, corrosion resistance and thermal-resistant.
As Mar-M247 has been employed in modern manufacturing, its mechanical properties has been mainly studied [3].
The properties of the main compositions for the coated cemented carbide inserts are also shown in Table 2.
Fig. 3 Tool life under different feed rates Fig. 4 Tool life under different cutting speeds Cutting temperature and chip disposal are two very important and correlated factors affecting milling.
Mar-M247 possesses the properties of high strength at high temperature, corrosion resistance and thermal-resistant.
As Mar-M247 has been employed in modern manufacturing, its mechanical properties has been mainly studied [3].
The properties of the main compositions for the coated cemented carbide inserts are also shown in Table 2.
Fig. 3 Tool life under different feed rates Fig. 4 Tool life under different cutting speeds Cutting temperature and chip disposal are two very important and correlated factors affecting milling.
Online since: August 2006
Authors: Jong Won Yoon, Yong Ho Choa, Kwang Bo Shim, Jae Kwang Kim, Kyung Hun Kim
In particular, mechanical
properties and ionic conductivity are important factors in determining the performance of solid
oxide fuel cells.
However, pure 8YSZ shows poor mechanical properties so it has some problems according to thin film for decreasing the resistivity of SOFCs and its ionic conductivity is totally decreased by siliceous phases present at the grain boundary [2].
The addition of Al2O3 into 8YSZ improves not only grain boundary conductivity but also mechanical properties by inhibiting grain growth [2, 3, 5].
However, with introduction of the heat-treatment process, ionic conductivity is improved by the increment of grain boundary conductivity but mechanical properties are deteriorated by grain growth.
By adding Al2O3, mechanical properties were increased by small and homogenous grains and the total ionic conductivity was enhanced by the increment of grain boundary conductivity with a scavenging siliceous phase.G G 5.
However, pure 8YSZ shows poor mechanical properties so it has some problems according to thin film for decreasing the resistivity of SOFCs and its ionic conductivity is totally decreased by siliceous phases present at the grain boundary [2].
The addition of Al2O3 into 8YSZ improves not only grain boundary conductivity but also mechanical properties by inhibiting grain growth [2, 3, 5].
However, with introduction of the heat-treatment process, ionic conductivity is improved by the increment of grain boundary conductivity but mechanical properties are deteriorated by grain growth.
By adding Al2O3, mechanical properties were increased by small and homogenous grains and the total ionic conductivity was enhanced by the increment of grain boundary conductivity with a scavenging siliceous phase.G G 5.
Online since: September 2014
Authors: Yun Lai Ren, Long Jiang Niu, Feng Hua Cao, Qing Wei Wang
Whether the inclusions are brittle or ductile, they differ greatly from the matrix material in the mechanical properties such as hardness, elongation, and yield stress.
According to the existing theoretical results, there are four factors affecting the formation of internal cracks of heavy forgings in the forging process i) internal temperature field in the ingot, ii) deformation, iii) rate of deformation, i.e. rate of strain and iv) stress conditions for the forging, i.e. the stress field inside the heavy forgings.
Of the four factors described above, the first three are easy to observe, measure and control whilst for the internal stress conditions of the forgings are not.
Since the chemical compositions of the brittle inclusions are different from those of the ductile inclusions, they have much different physical properties.
Stress intensity factors for ring-shaped crack surrounded by spherical inclusions.
According to the existing theoretical results, there are four factors affecting the formation of internal cracks of heavy forgings in the forging process i) internal temperature field in the ingot, ii) deformation, iii) rate of deformation, i.e. rate of strain and iv) stress conditions for the forging, i.e. the stress field inside the heavy forgings.
Of the four factors described above, the first three are easy to observe, measure and control whilst for the internal stress conditions of the forgings are not.
Since the chemical compositions of the brittle inclusions are different from those of the ductile inclusions, they have much different physical properties.
Stress intensity factors for ring-shaped crack surrounded by spherical inclusions.